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Simplify assembly in NX 7.5

Simplify assembly in NX 7.5

Simplify assembly in NX 7.5

(OP)
I want to ask why there is difference in behavior in Simplified Assembly wizard, when using unite all command.
First case is when using Extrude dialog during simplification sketch is made so sketch lines are collinear with edges of components.
Second case is when using Extrude dialog during simplification sketch is made so sketch lines are in small (1 or 2 mm) offset from edges of components.
In first case Unite All command in Simplify Assembly wizard give one solid body, so all bodies are merged in one simplified solid, in second same command gives one solid body that is extrusion and inside of it multiply solid bodies that are components. In second case after simplification is finished, and if regular Unite is used all bodies merge in one.
Question is how to make one solid body with simplified solid edged offseted from original components, without using Unite after?

PS. I have two short videos that show both cases, but I do not know how to upload them here.

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